STP1348: Effects of Geogrid in Enhancing the Resistance of Asphalt Concrete to Reflection Cracks

    Chang, DT-T
    Professor, Chung Yuan University, Chung Li,

    Lai, R-Q
    Graduated Student, Chung Yuan University, Chung Li,

    Chang, J-Y
    Graduated Student, Chung Yuan University, Chung Li,

    Wang, Y-H
    Graduated Student, Chung Yuan University, Chung Li,

    Pages: 14    Published: Jan 1998


    Abstract

    The formation and development of reflection cracks in asphalt concrete beams has been extensively studied. Among these studies, however, very few focused on the effects of geogrid in enhancing the resistance of asphalt concrete to reflection cracks. In addition, the nominal maximum particle size of the aggregate used in these studies is smaller than that of the dense graded asphaltic concrete required by the Construction Specifications commonly applied by the Taiwan Area National Freeway Bureau (TANFB). As a results the findings and/or conclusions of those studies cannot be effectively applied to most situations in Taiwan. It is therefore necessary to study the formation and development of reflection cracks in overlaid dense graded asphalt concrete. The geogrids used in this study were made of glass fiber, with strengths of 100 kN/m and 200 kN/m. A series of testing for a beam reinforced with geogrid of 100 kN/m strength showed a fatigue life 1.5 to 2.5 times that of the non-reinforced beam and for a beam reinforced with 200 kN/m geogrid, the fatigue life was 5 to 9 times longer. In addition, the modified asphalt appeared to perform nearly as well as the 200 kN/m grid. Findings indicate that the use of geogrid significantly enhances the resistance of asphalt concrete to the formation and development of reflection cracks.

    Keywords:

    geogrid, reflection crack, reinforce, fabric effective factor, effective reinforce factor, effective modify factor


    Paper ID: STP12850S

    Committee/Subcommittee: D04.33

    DOI: 10.1520/STP12850S


    CrossRef ASTM International is a member of CrossRef.